The adhesive works great but just for added security and because you never know what kind of climate or environment they are going through I do add packing tape across the adhesive strip. Mailers Link

In case anyone was wondering where to get the mailers. Here is a link to them on Amazon. The adhesive works great but just for added security and because you never know what kind of climate or environment they are going through I do add packing tape across the adhesive strip. Mailers Link